Nutrient burn or light stress

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benjones

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Nutrient burn or light stress
Nutrient burn or light stress 2
Nutrient burn or light stress 3


Hi THCfarmers . I have this slight tip burn all along the edge of some of my plants . I had the same thing on my last grow and I couldn’t figure out what it was . Both times it seems to have happened after I put the lights power up to 85-90% at 13-15 inches away ( mars hydro fce4800 , 480 watts ) . These are 4 weeks into flower . I will try and find the other thread where I had the same problem .

Any idea what this could be guys ?
 
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benjones

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Water going into the coco is 1.6 and coming out is 2.0 ( it rose in the last 2 weeks ) . Ph is 6.0 in 6.5 out

Last feed was 1.2 and the run off came down to 1.9

Temp 25c
Rh 60 .

I have a dehumidifier coming in the next day or 2
 
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benjones

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that was what happened on the last grow, it kind of looks like i am having the same issue and i would like to try to fix it before it gets as bad as it did last time . many thanks for reading
 
Zen_Seeker

Zen_Seeker

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I see you had epsom in your last grow, still using it? Approximately 15ml per 3.75L.

Fishing for why it’s yellow... unless it’s just the colour of the photo lighting?
 
Zen_Seeker

Zen_Seeker

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Much better. Now others will have a look and comment.

Yellow doesn’t seem to be an issue in these pics.

Looks like you’re doing better than me bud!

All I can see is a touch of canoeing at a few tops and maybe missing some Epsom if that’s striping on the newer leaves.

How’s the heat at canopy top? You got a small fan to circulate air?
 
Zen_Seeker

Zen_Seeker

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I add 1 gram a gallon of Epsom salt per feed
I work in metric or cooking terms for this. Imperial is for construction only. 😝

15ml = 1 TBSP
1g = ?

I’m not a Coco guy but there are a few good ones here. Search and maybe reach out to one if you don’t get any helpful replies.
 
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benjones

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ahh sorry mate, i am unsure what it is in ML or teaspoons 🙂

thanks for the compliment

heat at the canopy is the same as the room, about 25c . i have a wall fan and a fan on the floor so there is good air movement . i am just unsure if this is because i raised the power of the lights or if it is nute burn . it doesn't seem to have affected the lower growth
 
Zen_Seeker

Zen_Seeker

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ahh sorry mate, i am unsure what it is in ML or teaspoons 🙂

thanks for the compliment

heat at the canopy is the same as the room, about 25c . i have a wall fan and a fan on the floor so there is good air movement . i am just unsure if this is because i raised the power of the lights or if it is nute burn . it doesn't seem to have affected the lower growth
Unless really bad heat/light usually only seem to affect the top, at least at first.

So air is good.

If you mean the tips have a slight nutes burn that shouldn’t be an issue. Just back off a hair on feeding.

If light is the only change then try putting it down a bit at least until a Coco or staff member can advise.

What do you see as being an issue? They look pretty good from what I see.
 
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benjones

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I have slight tip burn which isn’t too bad , but along the edges I also have some kind of burn starting , if you see my thread I posted above on my last grow it got a lot worse . I would like to prevent it happening again if I can
 
Aqua Man

Aqua Man

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I have slight tip burn which isn’t too bad , but along the edges I also have some kind of burn starting , if you see my thread I posted above on my last grow it got a lot worse . I would like to prevent it happening again if I can
Aounds like very early k deficiency but just try increasing the feed frequency
 
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benjones

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@Aqua Man hi mate I hope you’re well

I feed every 2 days . They are in 5 gallon pots . Should I feed everyday ?
 
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